Great staple feeder for poison dart frogs, fish, young praying mantids, juvenile frogs and toads, tarantula slings and other reptiles, amphibians or captive animals that require small foods. Aged culture that is ready to feed within a few days of arrival and a fresh culture ready to feed out from when the producing culture crashes. Packaged in a secure, ventilated container with fruit fly media and excelsior. Virtual care sheet included with information on storage and feeding technique. Specially packaged to help ensure a live arrival in most weather conditions. When you order "producing" cultures, it simply means they are older and should be hatching new flies within 3 days. These are great for when you are short on food and need feedable flies as soon as possible. The "fresh" cultures are just a few days old and will not produce any new flies for 2-3 weeks.